That must have been very handy Maggie
It definitely would be a good idea for an enterprising local to operate a bus - even just twice per day on specific days. Perhaps picking up passengers in Arillas in the morning and dropping off around the local villages/resorts and back out again in the afternoon to pick them up.
Fortunately the villages and resorts are not too far flung from each other so for those who enjoy walking there is the opportunity to be dropped off in one place and picked up in another.
For example: A pleasant walk is from Sunset beach then down to the unspoilt village of Peroulades with it's narrow streets and ancient buildings, a stop off in Yiannis taverna... then down to Sidari but stopping off en-route yet again for more refreshment a The Orchard...cash m/c(!) in Sidari and home again. That is only an example of the many walks slightly further afield than Arillas. Some people may say that it's actually taking visitors out of Arillas to spend their euros elsewhere, however I feel it would broaden the variety of 'things to do' and encourage even more returnees to Arillas.
Just my pondering of course....!